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3 years ago

PLZ SHOW all WORK 40 points!!!!

Mathematics

2 answers:

Elena-2011 [213]3 years ago

5 0

Answer:

Kim is 24 and her sister is 12.

Step-by-step explanation:

a) Xx2+X

I used the variable X because that represents Kim's sisters age, which you need to know in order to find out Kim's age. To get Kim's sisters age use a guess and check table or pick numbers until you get to the correct answer.

b) 12x2=24

24+12=36

My solution is Kim is 24 and her sister is 12.

jolli1 [7]3 years ago

5 0

Kims Age let it be (k)
Her sister s age let it be (s)

2(s)=(k) *kim is twice of the age
(k)+(s)=36. *they add up to 36

*since k=2s, subtitude that into the equation k+s=36

(2s)+(s)=36
(3s)=36
s=12

*kim is twice as old as her sister.
12×2=24

*check work
12+24=36
12×2=24
mission accomplished

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4 years ago

In an orchestra, there are 15 woodwind players to 24 brass players. What is the ratio of woodwind players to brass players, writ

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3 years ago

Jim is trying to improve his speed on the track so he can qualify for the State Championships. As he is running, he goes from 70

kumpel [21]

Answer:

His acceleration is $\frac{1}{15}$ meters per seconds²

Step-by-step explanation:

Acceleration is the rate of change of the speed

The formula of acceleration is $a=\frac{v_{f}-v_{i}}{t}$ , where

$v_{f}$ is the final speed
$v_{i}$ is the initial speed
The unit of the acceleration is meters/second²

∵ Jim goes from 70 meters/minute (beginning speed) to

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∴ His initial speed $v_{i}$ = 70 meters/minute

- Change it the meter per second

∵ 1 minute = 60 seconds

∴ $\frac{70}{(1)(60)}=\frac{70}{60}=\frac{7}{6}$ meters/second

∴ $v_{i}$ = $\frac{7}{6}$ meters/second

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∴ $\frac{106}{(1)(60)}=\frac{106}{60}=\frac{53}{30}$ meters/second

∴ $v_{f}$ = $\frac{53}{30}$ meters/second

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3 0

3 years ago

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AlladinOne [14]

Answer:

1. 6

2. 2

Step-by-step explanation:

1. 9-t=3(t-5)

9-t=3t-15

+t +t

9=4t-15

+15 +15

24=4t

4 4

6=t

2.5(5y+1)=10y-25

25y+5=10y-25

+25 +25

25y+30=10y

-25 -25

30=-15y

15 15

2=y

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3 years ago

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Given:

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